contrib/osmo-sgsn.spec: fix build for almalinux:8

Add the missing "%if 0%{?suse_version}" around %service_del/add
commands, as these are only available on opensuse.

Fix for:
  error: line 106: Too many names: %preun  -n osmo-gtphub %service_del_preun   osmo-gtphub.service

Fixes: a07e6d9c (".deb/.rpm: add osmocom user during package install")
Change-Id: I89802f926bfccc0f7b4bb1ff64115b232b1db022
---
M contrib/osmo-sgsn.spec.in
1 file changed, 18 insertions(+), 0 deletions(-)

diff --git a/contrib/osmo-sgsn.spec.in b/contrib/osmo-sgsn.spec.in
index d1382cb..031cd14 100644
--- a/contrib/osmo-sgsn.spec.in
+++ b/contrib/osmo-sgsn.spec.in
@@ -100,10 +100,12 @@
 chown root:osmocom /etc/osmocom
 chmod 2775 /etc/osmocom
 
+%if 0%{?suse_version}
 %preun  -n osmo-gtphub %service_del_preun   osmo-gtphub.service
 %postun -n osmo-gtphub %service_del_postun  osmo-gtphub.service
 %pre    -n osmo-gtphub %service_add_pre     osmo-gtphub.service
 %post   -n osmo-gtphub %service_add_post    osmo-gtphub.service
+%endif
 
 %check
 make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)

